package com.itheima.reggie.controller;

import com.itheima.reggie.common.R;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

/*
实现文件上传和下载
 */
@RestController
@RequestMapping("/common")
public class CommonController {

    @Value("${reggie.path}")
    private String basePath;
    @PostMapping("/upload")
    public R upload(MultipartFile file) {
        /*
        1.获取文件名字
        2.获取文件后缀
        3.拼成最新名字
        4.创建一个目录对象并查看文件夹是否存在
        5.上传文件到临时指定路径
         */
        String originalFilename = file.getOriginalFilename();
        String substring = originalFilename.substring(originalFilename.lastIndexOf("."));
        String resultFileName= UUID.randomUUID()+substring;//ssfsf.jpg
        //F:\anli\ruijiwaimai\img
        File file1 = new File(basePath);
        if (!file1.exists()){
            file1.mkdirs();
        }
        try {
            file.transferTo(new File(basePath+resultFileName));
        } catch (IOException e) {
            e.printStackTrace();
        }

        return R.success(resultFileName);
    }

    @GetMapping("/download")
    public void download(String name, HttpServletResponse response){
        /*
        1.定义输入流，从本地临时存放的地方获取文件
        2.响应写出到浏览器页面，输出流
        3.设置响应格式
        4.输入流输出流转换
        5.关流
         */
        try {
            FileInputStream fileInputStream = new FileInputStream(new File(basePath + name));
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");
            int len=0;
            byte[] bytes =new byte[1024];
            while ((len=fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes, 0, len);
                outputStream.flush();
            }
            fileInputStream.close();
            outputStream.close();
        } catch (FileNotFoundException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

}
